Toshiba RAV-SP404ATP-E Installation Manual page 12

Tightening of Connecting Part
1. Align the centers of the connecting pipes and fully
tighten the flare nut with your fingers. Then fix the
nut with a wrench as shown in the figure and tighten
it with a torque wrench.
Half union or packed valve Flare nut
Externally Internally
threaded side threaded side
Fix with wrench. Tighten with torque wrench.
2. As shown in the figure, be sure to use two wrenches
to loosen or tighten the flare nut of the valve on the
gas side. If you use a single crescent, the flare nut
cannot be tightened to the required tightening
torque.
On the other hand, use a single crescent to loosen
or tighten the flare nut of the valve on the liquid side.
Outer dia. of copper pipe Tightening torque
6.4 mm (dia.) 14 to 18 (1.4 to 1.8 kgf•m)
12.7 mm (dia.) 49 to 61 (4.9 to 6.1 kgf•m)
Flare nut
Wrench for work
Wrench for
fixing
Cap
Tightened
Valve at gas side
EN-21
CAUTION
1. Do not put the crescent wrench on the cap.
The valve may break.
2. If applying excessive torque, the nut may break
according to some installation conditions.
NO GOOD
• After the installation work, be sure to check for gas
leaks of the pipe connections with nitrogen.
(Unit: N•m)
• Pressure of R410A is higher than that of R22 (Approx.
1.6 times).
Therefore, using a torque wrench, tighten the flare
pipe connecting sections that connect the indoor/
outdoor units at the specified tightening torque.
Incomplete connections may cause not only a gas
leak, but also trouble with the refrigeration cycle.
Do not apply refrigerant oil to the flared surface.
Loosened
- 11 -
Refrigerant Pipe Length
Single
Model
SP40, 45
SP56
Use of single wrench Model
is prohibited
SP40, 45
SP56
Allowable pipe length (m) Height difference (Indoor-outdoor H) (m)
Total length L Indoor unit: Upper
30 30
50 30
Pipe diameter (mm)
Gas side Liquid side
Ø12.7 Ø6.4
Ø12.7 Ø6.4
Figure of Single
Indoor Unit
Outdoor Unit
Outdoor unit: Lower
30
30
Number of bent portions
10 or less
10 or less
EN-22